iOS Undefined symbols for architecture i386:

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出现如下错误：

Undefined symbols for architecture i386:

  "_OBJC_CLASS_$_PlayerControlsBar", referenced from:

      objc-class-ref in PlayControl1.o

ld: symbol(s) not found for architecture i386

clang: error: linker command failed with exit code 1 (use -v to see invocation)

一般都是去Atarget -->Build Phases-->Complies Sources -->去看当前类的。m文件添加了没，或者少添加了什么类库

但有时会因为：

自己手写，或者复制别人代码时 在当前类的上面写个新类时，（由于疏忽）@interface 和@implementation有个少写 它也会报如上错误，原因你懂的

#import "PlayControl1.h"

#import "Button1.h"

@interface PlayerControlsBar : UIView

@property (nonatomic, strong) UIColor *color;

@end

//@implementation PlayerControlsBar

//

//@end

@implementation PlayControl1

{

    Button1 *btn1;

    Button1 *btn2;

    Button1 *btn3;

    Button1 *btn4;

    Button1 *btn5;

    PlayerControlsBar *_topBar;

    PlayerControlsBar *_bottomBar;

}

- (id)initWithFrame:(CGRect)frame

{

    self = [super init];

    if (self)

    {

        [self initWithUI];

    }

    return self;

}